drivers: rtc: support for Nuvoton numaker m46x

[cyliangtw]

This PR is to add Nuvoton numaker RTC driver including RTC alarm feature for M46x series.

[zephyrbot]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
hal_nuvoton	zephyrproject-rtos/hal_nuvoton@34efb92	zephyrproject-rtos/hal_nuvoton@ab342e6 (master)	zephyrproject-rtos/hal_nuvoton@34efb92e..ab342e69

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[bjarki-trackunit]

Have you run the RTC API test suite? Looking at the code I think there may be some inconsistencies with the API, running the test suite is good at identifying them if they exist :)

[de-nordic]

You may be interested in asking DTS whether you have your RTC enabled, for example the way we do that for Nordic:

zephyr/modules/hal_nordic/nrfx/Kconfig

Lines 268 to 274 in 2765d23

	config NRFX_RTC
	bool
	config NRFX_RTC0
	bool "RTC0 driver instance"
	depends on $(dt_nodelabel_has_compat,rtc0,$(DT_COMPAT_NORDIC_NRF_RTC))
	select NRFX_RTC

[cyliangtw]

Thanks of your suggestion.
My opinion is: hal is to support zephyr driver. So, Kconfig.numaker of zephyr rtc driver will asking DTS and select rtc's hal config.

[de-nordic]

If you take my comment https://github.com/zephyrproject-rtos/zephyr/pull/71929/files#r1579753122 into account, then you can have the select replaced with depends on and the depends on DT_HAS_NUVOTON_NUMAKER_RTC_ENABLED can be removed.

[cyliangtw]

Thanks of your opinion, DT_HAS_xx is asking DTS, and my thinking is like as:
Kconfig.nrfx:

config SPI_NRFX_SPI
	def_bool y
	depends on DT_HAS_NORDIC_NRF_SPI_ENABLED
	select NRFX_SPI0 if HAS_HW_NRF_SPI0

[bjarki-trackunit]

Looks good :)